Wednesday, February 23, 2011

Kingdom Animalia : Phyla

Today's schedule was going over the hydra and planarian lab, do pages 33-34 in the UP, and then notes.
Pages 33-34 was about a phylogenetic tree. *Animals on the outside are still living and animals that stop somewhere in the middle went extinct.

Embryonic development details:
Two branches for the animals with true coeloms:
  1. Mollusks, annelids, and anthropods- mouth comes first -- protostomes
  2. Echinoderms and chordates- anus comes first -- deuterostomes
Animalia Kingdom: 8 major phyla

Porifera- sponges
they are sessile;
simplest animals;
can be 1 cm or 2 m;
no nerves or muscles;
live in marine (salt water);
body is like a sace perforated with holes to let the water flow through;
digest food using phagocytosis;
eat bacteria from the water.
Cnidaria- jellyfish
have radial symmetry (more than one way to cut in half);
carnivores with stinging cells;
have a gastrovascular cavity (mouth and anus in one);
can be sessile (polyp) or free-floating (medusa).
Platyhelminthes- flatworms
bilateral symmetry (only one way to cut in half);
can live in marine, freshwater and even damp land;
can be parisitic (tapeworms);
no digestive tract in the parasites.
Nematoda- roundworms
most diverse animals known;
they live in wet soil and most aquatic habitats;
they have a completes digestive tract (mouth and an anus);
they are pseudocoelomates (body cavity partially lined with mesoderm;
can be very parasitic.
Mollusca- snails
soft bodied-usually with a hard protected shell;
feed using a straplike rasping organ called a radula;
can live in freshwater, marine, or land;
three main parts to the body-a muscular foot, a body mass with organs, and a drape-like mantle;
three major classes-gastropods (snails and slugs)
-bivalves (clams, oysters, and mussels)
-cephalopods (squids and octopuses)
Annelida- segmented worms
have body segementation (division on body into equal parts);
live in the sea, freshwater, and wet soil;
three major classes are earthworms, polychaetes, and leeches;
nourish the soil;
polychaetes are marine;
leeches have been used for medicine in the past.
Arthropoda- millipedes
have jointed appedages;
most successful phyla;
specialized functions: walking, feeding, sensory reception, copulation, defense, exoskeleton.

The homework was UP pgs 37-38, prelab pgs 45-54, nature cover, and to read chapter 17
Next scribe: Skyler
( these were colorful but the color didn't work :[

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